vapour vs Australian spelling

vapour and Australian spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
vapour	Yes	No	No	No
Australian spelling	Yes	No	No	No

vapour (noun)	Australian spelling (noun)
the process of becoming a vapor	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')
a visible suspension in the air of particles of some substance